honninkakuninshorui ga hitsuyou desu.

An identity-verification document is necessary.

Breakdown of honninkakuninshorui ga hitsuyou desu.

• です: to be
• が: subject particle
• 必要ひつよう: necessary
• 本人確認書類ほんにんかくにんしょるい: an identity-verification document

Questions & Answers about honninkakuninshorui ga hitsuyou desu.

How do you read 本人確認書類, and how is it built?

It is read ほんにんかくにんしょるい.

It is a compound noun made of three parts:

• 本人 = the person themselves, the actual person concerned
• 確認 = confirmation, verification
• 書類 = documents, paperwork

Put together, it refers to documents used to verify someone’s identity.

Is 本人確認書類 one word in Japanese?

Yes. In this sentence, 本人確認書類 functions as one long noun.

Japanese often makes formal or technical terms by putting nouns together directly, without particles in between. So instead of something like 本人の確認の書類, Japanese often compresses it into a tighter compound.

This is very common in official Japanese, especially on forms, websites, signs, and instructions.

Why is が used after 本人確認書類?

Here, が marks the thing that is necessary.

A very common pattern is:

• X が 必要です

This literally works like X is necessary.

That is a little different from English, where we often say I need X. Japanese often focuses on the item itself rather than on the person who needs it.

So in this sentence, 本人確認書類 is the thing being identified as necessary.